Emittance coupling driven by space charge in the CSNS linac

YIN Xue-Jun; FU Shi-Nian; PENG Jun

doi:10.1088/1674-1137/33/9/020

Chinese Physics C> 2009, Vol. 33> Issue(9) : 811-814 DOI: 10.1088/1674-1137/33/9/020

Emittance coupling driven by space charge in the CSNS linac

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Abstract：
In the conventional design of RF linacs, the bunched beams are not in thermal equilibrium. The space charge forces couple the particle motions between the transverse and the longitudinal directions. Furthermore it will cause the equipartitioning process which leads to emittance growth and halo formation. In the design of the China Spallation Neutron Source (CSNS) linac, three cases are investigated using the Hofmann stability charts. In this paper, we present the equipartitioning beam study of the CSNS Alvarez DTL linac.

References

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. Reiser M, Brown N. Phys. Rev. Lett., 1995, 74: 1111-11142. Hofmann I. Phys. Rev. E, 1998, 57: 4713-47243. Gluckstern R L. Phys. Rev. Lett., 1994, 73: 1247-12504. Gluckstern R L et al. Phys. Rev. E., 1998, 58: 4977-49905. FU Shi-Nian, FANG Shou-Xian, WEI Jie. Proceedings ofLINAC 2006. Knoxville, Tennessee, USA6. Hofmann I, Boine-Frankenheim O. Phys. Rev. Lett., 2001,87: 0348027. Reiser M. Theory and Design of Charged Particle Beams.New York: John Wiley Sons, 19948. Hofmann I, Franchetti G, Boine-Frankenheim O et al. Phys.Rev. ST Accel. Beams, 2003, 6: 024029. QIANG J, Ryne R D, Hofmann I. Phys. Rev. Lett., 2004,92: 17480110. Hofmann I, QIANG J, Ryne R D. Phys. Rev. Lett., 2001,86: 231311. Hofmann I, QIANG J, Ryne R D. Proceedings PAC99, NewYork, USA, 199912. Hofmann I, Boine-Frankenheim O. Phys. Rev. Lett., 2001,87: 03480213. Hofmann I, Franchetti G, QIANG J et al. Proceedings ofEPAC2002. Paris, France14. Hofmann I, Franchetti G, Boine-Frankenheim O et al. Pro-ceedings PAC01. Chicago, USA, 200115. Gerigk F, Vretenar M, Ryne R D. Proceedings PAC01.Chicago, USA, 2001

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YIN Xue-Jun, FU Shi-Nian and PENG Jun. Emittance coupling driven by space charge in the CSNS linac[J]. Chinese Physics C, 2009, 33(9): 811-814. doi: 10.1088/1674-1137/33/9/020

YIN Xue-Jun, FU Shi-Nian and PENG Jun. Emittance coupling driven by space charge in the CSNS linac[J]. Chinese Physics C, 2009, 33(9): 811-814. doi: 10.1088/1674-1137/33/9/020 shu

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Received: 2008-12-03
Revised: 2009-02-18

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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Emittance coupling driven by space charge in the CSNS linac

Corresponding author: YIN Xue-Jun,

Received Date: 2008-12-03

Accepted Date: 2009-02-18

Available Online: 2009-09-05

Abstract:

In the conventional design of RF linacs, the bunched beams are not in thermal equilibrium. The space charge forces couple the particle motions between the transverse and the longitudinal directions. Furthermore it will cause the equipartitioning process which leads to emittance growth and halo formation. In the design of the China Spallation Neutron Source (CSNS) linac, three cases are investigated using the Hofmann stability charts. In this paper, we present the equipartitioning beam study of the CSNS Alvarez DTL linac.

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Emittance coupling driven by space charge in the CSNS linac

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